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The impact of ionized outflows from z 2.5 quasars is not through instantaneous in situ quenching: the evidence from ALMA and VLT/SINFONI
Alexander, D. M.; Mullaney, J.; Mainieri, V. +7 more
We present high-resolution (~2.4 kpc) ALMA band 7 observations (rest-frame λ ~ 250 $\mu$m) of three powerful z ~ 2.5 quasars (Lbol = 1047.3-1047.5 erg s-1). These targets have previously been reported as showing evidence for suppressed star formation based on cavities in the narrow H α emission at the lo…
Visual Explanation of a Deep Learning Solar Flare Forecast Model and Its Relationship to Physical Parameters
Moon, Yong-Jae; Lim, Daye; Lee, Harim +2 more
In this study, we present a visual explanation of a deep learning solar flare forecast model and its relationship to physical parameters of solar active regions (ARs). For this, we use full-disk magnetograms at 00:00 UT from the Solar and Heliospheric Observatory/Michelson Doppler Imager and the Solar Dynamics Observatory/Helioseismic and Magnetic…
2D kinematics of massive stars near the Galactic Centre
Anderson, Jay; Bedin, Luigi R.; Sabbi, Elena +12 more
The presence of massive stars (MSs) in the region close to the Galactic Centre (GC) poses several questions about their origin. The harsh environment of the GC favours specific formation scenarios, each of which should imprint characteristic kinematic features on the MSs. We present a 2D kinematic analysis of MSs in a GC region surrounding Sgr A* …
Evidence for a Cosmic-Ray Gradient in the IM Lup Protoplanetary Disk
Seifert, Richard A.; Cleeves, L. Ilsedore; Adams, Fred C. +1 more
Protoplanetary disk evolution is strongly impacted by ionization from the central star and local environment, which collectively have been shown to drive chemical complexity and are expected to impact the transport of disk material. Nonetheless, ionization remains a poorly constrained input to many detailed modeling efforts. We use new and archiva…
Dynamical Stellar Masses of Pre-main-sequence Stars in Lupus and Taurus Obtained with ALMA Surveys in Comparison with Stellar Evolutionary Models
Koch, Patrick M.; Yen, Hsi-Wei; Testi, Leonardo +3 more
We analyzed archival molecular line data of pre-main-sequence (PMS) stars in the Lupus and Taurus star-forming regions obtained with ALMA surveys with an integration time of a few minutes per source. We stacked the data of 13CO and C18O (J = 2-1 and 3-2) and CN (N = 3-2, J = 7/2-5/2) lines to enhance the signal-to-noise ratio…
A Multi-Purpose Heliophysics L4 Mission
Solanki, S. K.; Arge, C. N.; Henney, C. J. +13 more
The Earth-Sun Lagrangian point 4 is a meta-stable location at 1 AU from the Sun, 60° ahead of Earth's orbit. It has an uninterrupted view of the solar photosphere centered on W60, the Earth's nominal magnetic field connection to the Sun. Such a mission on its own would serve as a solar remote sensing observatory that would oversee the entire solar…
M17 MIR: A Massive Protostar with Multiple Accretion Outbursts
Chen, Zhiwei; Chen, Xuepeng; Haas, Martin +3 more
We report the discovery of a massive protostar M17 MIR embedded in a hot molecular core in M17. The multiwavelength data obtained during 1993-2019 show significant mid-IR (MIR) variations, which can be split into three stages: the decreasing phase during 1993.03-mid-2004, the quiescent phase from mid-2004 to mid-2010, and the rebrightening phase f…
Red noise and pulsations in evolved massive stars
Nazé, Yaël; Gosset, Eric; Rauw, Gregor
We examine high-cadence space photometry taken by the Transiting Exoplanet Survey Satellite (TESS) of a sample of evolved massive stars: 26 Wolf-Rayet stars (WRs) and eight luminous blue variables (LBVs) or candidate LBVs. To avoid confusion problems, only stars without bright Gaia neighbours and without evidence of bound companions are considered…
A high-rate foreground of sub-second flares from geosynchronous satellites
Ofek, Eran O.; Polishook, David; Nir, Guy +3 more
The Weizmann Fast Astronomical Survey Telescope is a 55 cm optical survey telescope with a high-cadence (25 Hz) monitoring of the sky over a wide field of view (≈7 deg2). The high frame rate allows detection of sub-second transients over multiple images. We present a sample of ~0.1-0.3 s duration flares detected in an untargeted survey …
A bottom-heavy initial mass function for the likely-accreted blue-halo stars of the Milky Way
Maoz, Dan; Hallakoun, Na'ama
We use Gaia DR2 to measure the initial mass function (IMF) of stars within 250 pc and masses in the range of 0.2 < m/M⊙ < 1.0, separated according to kinematics and metallicity, as determined from Gaia transverse velocity, vT, and location on the Hertzsprung-Russell diagram (HRD). The predominant thin-disc population (v…